When one of the following booms is lifted/extended:
▪ pantograph
▪ upper boom
▪ telescopic boom
one or more M1A, M1B, M1E microswitches are activated
and consequently an automatic control activates the pot-
hole guards, whose fully lowered position is checked by
MPT1 and MPT2 microswitches.
Once a year check the working conditions of the
microswitches MPT1-MPT2.
The functions of the microswitches MPT1-MPT2 are the
following:
▪ with platform not in rest position (at least one of the
microswitches M1A-M1B-M1E is activated) if both
pot-hole guards are fully lowered the microswitches
MPT1-MPT2 are "free" and drive at safety speed is
allowed. Conversely, if one or both microswitches
MPT1-MPT2 remained activated it means that one or
both pot-hole guards are not in the correct position
and drive (with raised platform) is disabled; the alarm
condition is reported to the operator by the danger red
light on the platform.
▪ With platform in a rest position (all the microswitches
M1A-M1B-M1E are "free") the status of the
microswitches MPT1-MPT2 is not considered.
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